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erbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation.

The transformation of venous arterial blood by respiration; hematosis.

The lower group of the Wealden formation; -- so called from its development around Hastings, in Sussex, England.

The act or state of one who, or that which, heads; formation of a head.

To be informed by oral communication; to be told; to receive information by report or by letter. I have heard, sir, of such a man. Shak. I must hear from thee every day in the hour. Shak. To hear ill, to be blamed. [Obs.] Not only within his own camp, but also now at Rome, he heard ill for his temporizing and slow proc…

To inquire; to seek information. [Obs.] "Hearken after their offense." Shak.

o strain to do something difficult. The Church of England had struggled and heaved at a reformation ever since Wyclif's days. Atterbury.

The arterialization of the blood in the lungs; the formation of blood in general; hæmatogenesis.

In evolution, a deviation from the typical sequence in the formation of organs or parts.

Relating to heterogenesis; as, heterogenetic transformations.

An abnormal formation foreign to the economy, and composed of elements different from those are found in it in its normal condition. Dunglison.

The formation and development of organic tissues; histogeny; -- the opposite of histolysis.

Tissue-producing; connected with the formation and development of the organic tissues.

The science which treats of the laws relating to organic tissues, their formation, development, functions, etc.

uiry; the knowledge of facts and events, so obtained; hence, a formal statement of such information; a narrative; a description; a written record; as, the history of a patient's case; the history of a legislative bill.

The formation of homologous tissues.

d, after a period of drought or deficiency of food. In some instances, a process of spore formation seems to occur within such cysts.

An extinct genus of toothed birds found in the American Cretaceous formation. It is remarkable for having biconcave vertebræ, and sharp, conical teeth set in sockets. Its wings were well developed. It is the type of the order Odontotormæ.

ng in length from ten to thirty feet, are known from the Liassic, Oölitic, and Cretaceous formations.

The formation of a figure, representation, or semblance; a delineation or description. Some kind of apish imitations, counterfeit iconisms. Cudworth.